/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Selection/MeshTopologySelectionMechanic.h
Can be used by in an OnSelectionChanged event to inspect the clicked location (i.e., the values returned by theUpdateSelection()function when the click happened).
void GetClickedHitPosition ( FVector3d & PositionOut, FVector3d & NormalOut ) const